The phrase "inner leaf" refers to the inner part or layer of a leaf, which is usually softer and contains important cells that help the leaf function properly. Full definition
In the meantime, weigh about 100 g / 3.5 oz of the small inner leaves of the cabbage, the ones that you will not be able to fill anyway. (whereismyspoon.co)
I love putting the more tender inner leaves chopped up in salads. (101cookbooks.com)
The part of the plant consumed is the compact inner leaves, while the core and outer leaves are generally discarded or sometimes used to feed livestock. (herbazest.com)